US4944338A - Barking method, and an apparatus for utilization of the method - Google Patents

Barking method, and an apparatus for utilization of the method Download PDF

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Publication number
US4944338A
US4944338A US07/252,455 US25245588A US4944338A US 4944338 A US4944338 A US 4944338A US 25245588 A US25245588 A US 25245588A US 4944338 A US4944338 A US 4944338A
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United States
Prior art keywords
log
barking
rotating member
rotation
cutting
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Expired - Fee Related
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US07/252,455
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English (en)
Inventor
Kjell-Anders Eriksson
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/04—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks in rotating drums
    • B27L1/05—Drums therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/12—Debarking or removing vestiges of branches from trees or logs; Machines therefor using pliable tools, e.g. chains, cables
    • B27L1/125—Debarking or removing vestiges of branches from trees or logs; Machines therefor using pliable tools, e.g. chains, cables stretched between two points

Definitions

  • the present invention relates to a barking method, and a device for utilization of the method.
  • barking using barking means such as a chain, wire or similar device, which is brought to take up frictional contact against the log to be barked, as for example as disclosed in Swedish Patent SE 122 987, SE 124 273, SE 130 000, SE 139 367 or SE 145 114, and with necessary contact force being obtained by means of one or a number of spring members.
  • barking means such as a chain, wire or similar device, which is brought to take up frictional contact against the log to be barked, as for example as disclosed in Swedish Patent SE 122 987, SE 124 273, SE 130 000, SE 139 367 or SE 145 114, and with necessary contact force being obtained by means of one or a number of spring members.
  • An alternative embodiment including a triangular link system carrying a barking knife and with springs causing contact pressure, and including a motor driven drive means, is disclosed in CH 233 629, as a complete unit intended to perform a rotary movement along a tree, thereby performing a surrounding barking operation by means of the barking knife.
  • Previously known methods do not facilitate adjustment of the removal capacity during the barking operation, since the contact pressure of the barking member against a log is entirely related to the force applied by the springs used.
  • An ideally suited barking method should allow for such a continuous adjustment of the removal capacity, which should be related to the type of log, but also the existing season of the year, since barking can be performed with less contact pressure at higher temperature (summer time) than at a lower temperature (winter time).
  • the spring members are also less suited for location within a barking unit, since small bark fragments can be located between adjacent turns in the springs, and thus completely change a predetermined contact pressure for the spring loaded barking members.
  • the object of the present invention is to disclose a barking method, and an apparatus for utilization of the method, offering the possibility to continuously change the barking depth during operation, without changing the feeding speed of the log, and also removing the problems of changes in contact pressure related to previously known spring loaded barking member. Furthermore, the present invention also makes it possible to perform barking with a barking unit having an extremely uncomplicated design, having high dependability in operation, low manufacturing costs, and requiring a minimum of maintenance.
  • the method according to the present invention comprises causing a log during a substantially linear feed movement to pass one or a number of barking means, arranged to perform a surrounding and rotary movement in relation to the log, and it is mainly characterized in that the barking means by influence from centrifugal force during the surrounding and rotary movement in relation to the log are pressed against the log, and that the contact pressure of the barking means is continuously variable by an increase/decrease of the rotary speed for the barking means in relation to the log.
  • the apparatus for utilization of the method according to the invention includes a rotary member through which a log is arranged to pass during a linear feed movement in the longitudinal direction of the log, the rotary member being arranged to support barking means, arranged to debark a log by means of frictional contact or a cutting operation, and it is mainly characterized in that the barking means are arranged attached or joined with means which under influence of centrifugal force press the barking means with a contact pressure related to the rotary speed of the rotary member.
  • FIG. 1 is a cross-sectional view of a first embodiment of an apparatus for utilization of the method according to the invention
  • FIG. 2 is a view substantially corresponding to FIG. 1, and showing the first embodiment slightly modified;
  • FIG. 3 is a cross-sectional view of a second embodiment for utilization of the method according to the invention.
  • FIG. 4 is longitudinal cross-sectional view of a third embodiment for utilization of the method according to the invention.
  • FIG. 5 is a plan view of a barking means included in the embodiment shown in FIG. 4.
  • a first embodiment according to the present invention comprising a sling shaped member 1 formed from a chain, wire or similar element, attached at two opposed points against two pistonshaped counterweights 2, 2', axially displacable in a surrounding tubular member 3, 3', respectively.
  • the member 1 may advantageously be arranged to carry at least two cutting means 4, 4', located in an intermediate position in relation to the attachment points for the member 1 against the counterweights 2, 2'.
  • the tubular members 3, 3' are arranged attached against a drum shaped member 5, arranged to perform a rotary movement in relation to a log 6 moved through the member 1.
  • the member 5 can be arranged with outwardly extending fan wings 7, arranged to cause an air stream in a surrounding housing 8 having an outlet opening 9 for removed bark.
  • the member 5 is arranged with peripherally located through openings, through which removed bark can be thrown out, thereafter being transported by the air stream in the housing 8 to the outlet opening 9.
  • two spring means 10, 10' are shown, attached to the member 1 at points within an intermediately located region in relation to the attachment points for the member 1 to the counterweights 2, 2', intended to assure that the member 1 is opened maximally when the member 5 does not rotate, or rotates at a low speed.
  • a log 6 is inserted into the member 5 into a position where a first end portion is surrounded by the member 1, whereafter the rotary speed of the member 5 is increased.
  • the piston shaped counterweights 2, 2' are made subject to a centrifugal force and perform a displcement movement in relation to the surrounding tubular members 3, 3' in direction away from the rotary center of member 5, whereby the member 1 is stretched, and the intermediate part is pressed in direction inwardly against the outer peripheral surface of the log 6.
  • the cutting means 4, 4' are thereby obviously also pressed into contact with log 6, while rotated with member 1 by means of the member 5, and perform surrounding debarking of the log 6. Since the log simultaneously is fed with a linear movement through the member 5, debarking is performed over the entire length of the log 6.
  • spring means 10, 10' which obviously can be used to accomplish an opening movement for the sling 1 can be replaced by two wires 12, 12' or similar element, each one attached to a centrally located part of member 1, and extending through apertures 18 to a point outside the peripheral surface of member 5.
  • spring means 10, 10' By influencing members 11, 11' with forces in the directions of arrows A, and/or the wires 12, 12' with forces in the directions indicated by arrows B, an opening movement can be performed, despite a high rotary speed being maintained for membef 5.
  • the member 1 with associated cutting members 4, 4' return to a contact position pressed against an inserted log 6.
  • FIG. 3 is only intended to disclose how the number of sling shaped members 1 can be varied as described, and shows an embodiment corresponding to FIG. 1, but including two sling shaped members 1, 1'. It should be noted, that the number of members 1, 1' can be increased further, in which case these are located successively following each other in the member 5.
  • cutting members 4, 4' also can be excluded, i.e. necessary debarking can often be performed by means of frictional contact between member 1 and log 6.
  • FIGS. 4 and 5 The use of centrifugal force for obtaining required contact pressure for the barking means also makes other embodiments possible, and such a further example is shown in FIGS. 4 and 5.
  • chains, wires or similar elements are not used to accomplish barking, or to carry cutting members, intended to perform barking.
  • one or preferably a number of barking means are used, comprising a pivotally attached member 13, 13', adjacent to a first end portion carrying a cutting means 14, 14', and adjacent to a second end portion carrying a counterweight 15, 15'.
  • Members 13, 13' are supported by a rotary member 16, into which a log 6 is insertable, and through which it is moved in a substantially linear feeding movement.
  • the counterweights 15, 15' are made subject to a centrifugal force, causing the counterweights 15, 15' to move in direction away from the rotary center of the rotary member 16.
  • the pivotally attached members 13, 13' perform a pivoting movement, whereby the cutting means 14, 14' carried adjacent to the first end portion are pressed against the periphral surface of the log 6, and perform debarking.
  • Possibility to insert a log 6 while maintaining a rotary speed for barking is also offered, e.g. by restricting the pivoting movement of the pivotally attached members 13, 13' in direction towards each other, or by causing a forced opening movement thereof, e.g. by a forced movement of the counterweights 15, 15' in direction towards the rotary center of the rotary member 16 with a means not shown. Insertion at a reduced rotary speed can obviously also be performed.
  • the removal capacity can be affected by influencing the linear feed speed of the log 6, and also by changes in the rotary speed of the barking means around the log 6.
  • An increased rotary speed will obviously result in an increased contact pressure, and a reduction of the contact pressure is accomplished by a reduction of the rotary speed.
  • the present invention thus makes it possible to use centrifugal force to obtain required contact pressure when barking, and also a previously unknown method to vary said contact pressure in a simple way. It is further possible to accomplish fast and continuous barking of successively following logs, and simple and reliable technical designs are also provided.
  • Such a feeler means may be for example a sleeve shaped member 22 slidably engageable on each arm of members 13, 13', on which cutting means 14, 14' are mounted, having set screw 24 thereon in a well known manner for engaging with and clamping member 22 in a desired position so that the inner end 26 thereof engages log 6 to limit the inward movement of the cutting means.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Soil Working Implements (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Steroid Compounds (AREA)
  • Vending Machines For Individual Products (AREA)
  • Sewing Machines And Sewing (AREA)
US07/252,455 1986-03-27 1987-03-25 Barking method, and an apparatus for utilization of the method Expired - Fee Related US4944338A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8601449A SE460181B (sv) 1986-03-27 1986-03-27 Barkningsanordning
SE86014495 1986-03-27

Publications (1)

Publication Number Publication Date
US4944338A true US4944338A (en) 1990-07-31

Family

ID=20364003

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/252,455 Expired - Fee Related US4944338A (en) 1986-03-27 1987-03-25 Barking method, and an apparatus for utilization of the method

Country Status (10)

Country Link
US (1) US4944338A (de)
EP (1) EP0301010B1 (de)
JP (1) JPS63503297A (de)
AT (1) ATE69991T1 (de)
AU (1) AU601971B2 (de)
DE (1) DE3775055D1 (de)
FI (1) FI884406L (de)
NO (1) NO164645C (de)
SE (1) SE460181B (de)
WO (1) WO1987005851A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775274A (en) * 1951-03-08 1956-12-25 Andersson Axel Erland Bark-removing machine having selflifting blunt-edge tools
DE972444C (de) * 1952-02-27 1959-07-23 Oskar Skoglund Maschine zum Entrinden von Baumstaemmen
US3098512A (en) * 1959-09-04 1963-07-23 Carl W Kendrick Debarking machine
CA701563A (en) * 1965-01-12 Valo Bruno Arrangement of cutters in barking machines of drum type
US4425951A (en) * 1982-02-16 1984-01-17 Brunette Machine Works, Ltd. Hollow debarking arm

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE124273C1 (de) * 1949-01-01
US2692623A (en) * 1951-03-22 1954-10-26 Svenska Cellulosa Ab Debarking machine having bark-removing members yieldably connected to centrifugally-actuated weights
US2718910A (en) * 1952-10-31 1955-09-27 Clair Harold V St Rotary-head bark-remover having pivotable knife-carrying arms operable by centrifugal force

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA701563A (en) * 1965-01-12 Valo Bruno Arrangement of cutters in barking machines of drum type
US2775274A (en) * 1951-03-08 1956-12-25 Andersson Axel Erland Bark-removing machine having selflifting blunt-edge tools
DE972444C (de) * 1952-02-27 1959-07-23 Oskar Skoglund Maschine zum Entrinden von Baumstaemmen
US3098512A (en) * 1959-09-04 1963-07-23 Carl W Kendrick Debarking machine
US4425951A (en) * 1982-02-16 1984-01-17 Brunette Machine Works, Ltd. Hollow debarking arm

Also Published As

Publication number Publication date
FI884406A0 (fi) 1988-09-26
NO874898L (no) 1987-11-24
AU601971B2 (en) 1990-09-27
SE460181B (sv) 1989-09-18
EP0301010B1 (de) 1991-12-04
WO1987005851A1 (en) 1987-10-08
NO164645C (no) 1990-10-31
EP0301010A1 (de) 1989-02-01
FI884406A7 (fi) 1988-09-26
SE8601449L (sv) 1987-09-28
SE8601449D0 (sv) 1986-03-27
ATE69991T1 (de) 1991-12-15
NO874898D0 (no) 1987-11-24
AU7170087A (en) 1987-10-20
FI884406L (fi) 1988-09-26
JPS63503297A (ja) 1988-12-02
NO164645B (no) 1990-07-23
DE3775055D1 (de) 1992-01-16

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Effective date: 19940803

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362